Adjustable standing desk



FIG. 1 is a top front perspective view of an adjustable standing desk, showing my new design;

FIG. 2 is a top front perspective view of an adjustable standing desk with the desk top portion in a lower position;

FIG. 3 is a front view of FIG. 1;

FIG. 4 is a back view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is top view thereof;

FIG. 8 is a bottom view thereof; and,

FIG. 9 is a perspective view of an adjustable standing desk in an environment of use.

The broken line portion of the figure drawings is included to show portions of the article and environment that form no part of the claimed design. 

CLAIM The ornamental design for adjustable standing desk, as shown and described. 